South Boston Weather in September

During September, South Boston experiences high daytime temperatures of 27°C (81°F) and cooler nights around 15°C (59°F). As the wettest month of the year, expect frequent rainfall.

Rainfall in South Boston in September

Being the wettest month, having an umbrella on standby can help you avoid getting caught in the rain. Looking at the last 30 years, the data shows about 9 days with rain, averaging 116 mm (4.6 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in South Boston in September

In September, South Boston sees high temperatures, with highs of 27°C (81°F). Nights drop to around 15°C (59°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. April and October typically offer the best weather for South Boston.